from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Causing irritation, especially physical irritation.
- n. A source of irritation: tobacco smoke, a common eye irritant.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Causing irritation or inflammation.
- n. Any medication designed to cause irritation
- n. A source of irritation.
from the GNU version of the Collaborative International Dictionary of English
- adj. Rendering null and void; conditionally invalidating.
- adj. Irritating; producing irritation or inflammation.
- n. That which irritates or excites.
- n. Any agent by which irritation is produced
- n. A poison that produces inflammation.
from The Century Dictionary and Cyclopedia
- Irritating; exasperating; specifically, producing pain, heat, or tension; causing inflammation: as, an irritant poison.
- n. That which irritates or exasperates; specifically, a therapeutic agent that causes pain, heat, or tension, or a poison that produces inflammation.
- Rendering null and void.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. something that causes irritation and annoyance
French, from Latin irrītāns, irrītant-, present participle of irrītāre, to irritate.(American Heritage® Dictionary of the English Language, Fourth Edition)
From French (Wiktionary)